Mirumo Tsukiyama (月山 観母, Tsukiyama Mirumo) is an extremely wealthy and eccentric Ghoul, well-known within Ghoul society for being extravagant. He is the father of Shuu Tsukiyama, and took part in the Auction as a major bidder under the alias Croque Monsieur (クロックムッシュ, Kurokku Musshu).